pdf2zine.py: put arg parsing in function

pdf2zine.py

@@ -2,26 +2,44 @@
 
 from pypdf import PaperSize, PdfReader, PdfWriter, Transformation
 from pypdf.generic import RectangleObject
-
-
 import argparse 
-parser = argparse.ArgumentParser(
-    prog='pdf2zine',
-    description='pdf2zine rearranges pages for signature printing ',
-    epilog='onipa')
 
-parser.add_argument('pdf_file')           # positional argument
-#parser.add_argument('pages', type=int)           # positional argument
-#parser.add_argument('-s', '--signature')      # option that takes a value
-parser.add_argument('-v', '--verbose', action='store_true')  # on/off flag
-parser.add_argument('-z', '--zine', action='store_true', help='Input pdf needs to be 16 pages')
-parser.add_argument('-s', '--signature', 
-    dest='signature', 
-    type=int,
-    action='store',
-    default=0,
-    help='')
-args = parser.parse_args()
+# TODO 
+# - default:
+# - - folio portrait
+# - folio fold landscape 
+# - folio cut landscape
+# - octavo portrait (zine) 
+# - landscape 0 
+# - done: 
+    
+
+def get_arguments():
+    parser = argparse.ArgumentParser(
+        prog='pdf2zine',
+        description='pdf2zine rearranges pages for signature printing ',
+        epilog='onipa')
+
+    parser.add_argument('pdf_file')           # positional argument
+    #parser.add_argument('pages', type=int)           # positional argument
+    #parser.add_argument('-s', '--signature')      # option that takes a value
+    parser.add_argument('-v', '--verbose', action='store_true')  # on/off flag
+    parser.add_argument('-z', '--zine', action='store_true', help='Input pdf needs to be 16 pages')
+    parser.add_argument('-s', '--signature', 
+        dest='signature', 
+        type=int,
+        action='store',
+        default=0,
+        help='')
+    parser.add_argument('-l', '--landscape', 
+        dest='landscape', 
+        type=int,
+        action='store',
+        default=0,
+        help='')
+    args = parser.parse_args()
+    return args
+args = get_arguments()
 
 signature_size=args.signature
 if signature_size < 0 : 
@@ -40,9 +58,22 @@ pages=number_of_pages
 lst=[]
 
 def get_reorder(number_of_pages: int, signature_size: int):
+    # TODO:
+    #    - if landspace 
+    # panu = 64
+    # sisi = 0 
+    # 1, 3, 2, 4
+    # 1, 5, 2, 6,  3, 7, 4, 8
+    # 1, 7, 2, 8,  3, 9, 4,10,  5,11, 6, 12
+    # simple cut and combine 
+    # 1. i+1
+    # 2. N/2+1
+    # 3. i + 2
+    # 4. N/2+2
     panu=number_of_pages
     sisi=signature_size
 
+
     #p\s|  1 |  2 |  3 |  4 | 
     #-----------------------
     # 1 |  4 |  8 | 12 | 16 | 
@@ -199,6 +230,8 @@ def make_zine(reader, lst):
     #        )
     return writer
 
+
+    
 lst=get_reorder(number_of_pages, signature_size)
 if args.zine :
     if number_of_pages != 16: